From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Advising Mr. Clark of an experimental Electrical Speed Indicator fitted to a 250 HP Engine A 2.
| Identifier | ExFiles\Box 34\2\ Scan033 | |
| Date | 12th December 1916 | |
| COPY. 46883. 12.12.16. Mr.Clark. 250 H.P. ENGINE A 2. The above engine has been fitted with the following experimental part:- X.2238 - Electrical Speed Indicator. (Sgd) R.H. Coverley | ||